Document and Entity Information Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Condensed Consolidated Statement of Comprehensive Income No definition available. Net Revenue from Contract with Customer [Abstract] Net sales: Revenue from Contract with Customer, Excluding Assessed Tax Total net sales Net sales Cost of Revenue [Abstract] Cost of sales and operating expenses: Cost of Goods and Services Sold Total cost of sales and operating expenses Gross Profit Gross income Selling, General and Administrative Expense Selling, general and administrative expenses Operating Income (Loss) Operating Income (Loss): Operating income Nonoperating Income (Expense) [Abstract] Other income (expense): Interest Expense Interest expense Interest income amount of which the earnings reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Interest income includes amortization of premiums and accretion of discounts to maturity. Investment Income Interest including Accretion or Amortization of Discount or Premium Interest income Interest Income from Affiliates Interest income from affiliates Income (Loss) from Equity Method Investments Loss (income) from affiliates Income (loss) from affiliates Income (Loss) from Affiliates: Represents the other investment income expense, net earned by the entity during the reporting period. Other Investment Income (Expense), Net Other investment loss (income), net Other investment income (loss), net Foreign Currency Transaction Gain (Loss), before Tax Foreign currency gains, net Other Nonoperating Income (Expense) Miscellaneous, net Nonoperating Income (Expense) Total other income (loss), net Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Earnings before income taxes Income Tax Expense (Benefit) Income tax expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net earnings Net earnings Net Income (Loss) Attributable to Noncontrolling Interest Less: Net loss attributable to noncontrolling interests Net Income (Loss) Available to Common Stockholders, Basic Net earnings attributable to Seaboard Earnings Per Share, Basic Earnings per common share Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss), net of income tax expense of $0 and $(1): Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustment Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Unrealized gain on investments Unrealized gain (loss) on investments Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent Unrecognized pension cost Other Comprehensive Income (Loss), Net of Tax Other comprehensive loss, net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest Less: Comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to Seaboard Weighted Average Number of Shares Outstanding, Basic Average number of shares outstanding (in shares) Common Stock, Dividends, Per Share, Declared Dividends declared per common share (in dollars per share) Products and Services [Axis] Products And Services [Domain] Products and Services [Domain] Represents information related to products. Products [Member] Products Represents information related to services. Services [Member] Services Revenue from Related Parties Sales to affiliates Other Comprehensive Income (Loss), Tax Other comprehensive income (loss), income tax benefit (expense) Condensed Consolidated Balance Sheets Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of year Cash and cash equivalents Short-term Investments Short-term investments Total trading short-term investments Receivables, Net, Current Receivables, net Inventory, Net Inventories Total inventories Inventory Other Assets, Current Other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Net property, plant and equipment Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Total investment in affiliate Investments in and advances to affiliates Investment in and Advances to Affiliates: Notes Receivable, Related Parties, Noncurrent Notes receivable from affiliates, net Goodwill Goodwill Other Assets, Noncurrent Other non-current assets Assets Total Assets: Total assets Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity Liabilities, Current [Abstract] Current liabilities: Short-term Bank Loans and Notes Payable Notes payable to banks Long-term Debt and Capital Lease Obligations, Current Current maturities of long-term debt Accounts Payable, Current Accounts payable Contract with Customer, Liability, Current Deferred revenue Deferred revenue - current Other Liabilities, Current Other current liabilities Liabilities, Current Total current liabilities Long-term Debt and Capital Lease Obligations Long-term debt, less current maturities Deferred Tax Liabilities, Net, Noncurrent Deferred income taxes Accrued Income Taxes, Noncurrent Long-term income tax liability Other Liabilities, Noncurrent Other liabilities Liabilities, Noncurrent Total non-current liabilities Commitments and Contingencies. Commitments and contingent liabilities Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Stockholders' equity: Common Stock, Value, Issued Common stock of $1 par value. Authorized 1,250,000 shares; issued and outstanding 1,170,550 shares Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Retained Earnings (Accumulated Deficit) Retained earnings Stockholders' Equity Attributable to Parent Total Seaboard stockholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total equity Liabilities and Equity Total liabilities and stockholders' equity Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, Authorized shares Common Stock, Shares, Issued Common stock, issued shares Common Stock, Shares, Outstanding Common stock, outstanding shares Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net earnings to cash from operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Deferred Income Tax Expense (Benefit) Deferred income taxes Proceeds from Equity Method Investment, Dividends or Distributions Dividends received from affiliates Other Noncash Income (Expense) and Other Items Other, net Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities, net of acquisitions: Changes in assets and liabilities, net of acquisitions: Increase (Decrease) in Receivables Receivables, net of allowance Increase (Decrease) in Inventories Inventories Increase (Decrease) in Other Current Assets Other current assets Increase (Decrease) in Current Liabilities Exclusive of Debt, Current Current liabilities, exclusive of debt Current liabilities, exclusive of debt Other Operating Activities, Cash Flow Statement Other, net Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash from operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash flows from investing activities: Payments to Acquire Short-term Investments Purchase of short-term investments Proceeds from Sale of Short-term Investments Proceeds from the sale of short-term investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Proceeds from the maturity of short-term investments Payments to Acquire Property, Plant, and Equipment Capital expenditures Payments to Acquire Businesses, Gross Cash paid for acquisition of businesses Payments to Acquire Interest in Subsidiaries and Affiliates Investments in and advances to affiliates, net Proceeds from Collection of Advance to Affiliate Principal payments received on notes receivable from affiliates Payments for (Proceeds from) Long-term Investments Purchase of long-term investments Payments for (Proceeds from) Other Investing Activities Other, net Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash from investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash flows from financing activities: Proceeds from (Repayments of) Short-term Debt Notes payable to banks, net Proceeds from Issuance of Long-term Debt Proceeds from long-term debt Repayments of Long-term Debt Principal payments of long-term debt Payments of Ordinary Dividends, Common Stock Dividends paid Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash from financing activities Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations Effect of exchange rate changes on cash and cash equivalents Net Cash Provided by (Used in) Continuing Operations Net change in cash and cash equivalents Accounting Policies and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Accounting Policies and Basis of Presentation Revenue Recognition Revenue from Contract with Customer [Text Block] Revenue Recognition Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investments Inventories Inventory Disclosure [Text Block] Inventories Income Taxes Income Tax Disclosure [Text Block] Income Taxes No definition available. Derivatives and Fair Value of Financial Instruments Derivatives and Fair Value [Text Block] Derivatives and Fair Value of Financial Instruments Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefits Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Notes Payable, Long-term Debt, Commitments and Contingencies Stockholders' Equity and Accumulated Other Comprehensive Loss Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity and Accumulated Other Comprehensive Loss Segment Information Segment Reporting Disclosure [Text Block] Segment Information Use of Estimates, Policy [Policy Text Block] Use of Estimates Disclosure of accounting policy for supplemental non-cash transactions. Supplemental Noncash Transactions Policy Text Block Supplemental Non-Cash Transactions New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Revenue Recognition Disaggregation of Revenue [Table Text Block] Schedule of sales disaggregated by revenue source and segment Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of impacts of adopting ASU 2014-09 Investment [Table Text Block] Summary of the amortized cost and estimated fair value of short-term investments classified as trading securities Schedule of Inventory, Current [Table Text Block] Summary of inventories Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of assets and liabilities measured at fair value on a recurring basis Derivative Instruments, Gain (Loss) [Table Text Block] Schedule of gain or (loss) recognized for each type of derivative and its location in the condensed consolidated statements of comprehensive income Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of fair value of each type of derivative and its location in the condensed consolidated balance sheets Schedule of Net Benefit Costs [Table Text Block] Schedule of net periodic benefit cost of plans Notes Payable, Long-term Debt, Commitments and Contingencies Schedule of Long-term Debt Instruments [Table Text Block] Summary of long-term debt Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Schedule of changes in the components of other comprehensive loss, net of related taxes Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of components of accumulated other comprehensive loss, net of related taxes Investment, Name [Axis] Equity Method Investee Name [Domain] Investment, Name [Domain] Represents the information pertaining to Butterball, LLC. Butterball L L C [Member] Butterball, LLC Schedule of Business Acquisitions, by Acquisition [Table Text Block] Summary of total purchase price for this acquisition subject to working capital adjustment, based on acquisition date fair values and using the exchange rate in effect at the time of acquisition Business Acquisition, Pro Forma Information [Table Text Block] Schedule of proforma information related to acquisitions Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of allocation of purchase price Condensed Income Statement [Table Text Block] Schedule of summarized income statement information Revenue from External Customers by Products and Services [Table Text Block] Summary of specific financial information related to sales to external customers Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Summary of specific financial information related to operating income (loss) Tabular disclosure of income or loss from equity method investments by segment. Schedule of Income (Loss) from Equity Method Investments by Segment [Text Block] Summary of specific financial information related to income (loss) from affiliates Reconciliation of Assets from Segment to Consolidated [Table Text Block] Summary of specific financial information related to total assets Tabular disclosure of investments in and advances to affiliates by segment. Schedule of Investment in and Advances to Affiliates by Segment [Text Block] Summary of specific financial information related to investments in and advances to affiliates Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Accounting Policies and Basis of Presentation Revenue - cumulative effect Supplemental Non-Cash Transaction Notes Issued Note payable Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Earn-out, high end of range Contingent consideration Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Segment Totals Segments [Axis] Segment [Domain] Segments [Domain] Represents the Pork segment of the entity. Pork Segment [Member] Pork Represents the Commodity Trading and Milling segment of the entity. Commodity Trading And Milling [Member] Commodity Trading and Milling Represents the Marine segment of the entity. Marine [Member] Marine Represents the Sugar segment of the entity. Sugar [Member] Sugar Represents the Power segment of the entity. Power [Member] Power All Other Segments [Member] All Other Concentration Risk, Percentage Concentration risk percentage Revenue, Remaining Performance Obligation Performance Obligation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue. Revenue Remaining Performance Obligation Percentage Performance obligation (as a percent) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Expected timing of satisfaction period Revenue, Practical Expedient, Remaining Performance Obligation [true/false] Practical expedient, disclosure of performance obligation Contract with Customer, Asset and Liability [Abstract] Contract with Customer, Asset and Liability Contract with Customer, Liability, Revenue Recognized Revenue recognized included in deferred revenue at beginning of quarter Investment [Table] Currency [Axis] All Currencies [Domain] All Currencies [Domain] Represents currencies other than US Dollar. Non U S Dollar [Member] Denominated in foreign currencies E U [R] Denominated in Euros J P [Y] Denominated in Japanese Yen G B [P] Denominated in British pounds C H [F] Denominated in Swiss Franc Investment [Axis] Investment [Domain] Investment [Domain] Availableforsale Securities [Member] Available-for-sale securities Money Market Funds [Member] Money market funds Represents the domestic equity securities. Domestic Equity Securities [Member] Domestic equity securities Represents the foreign equity securities. Foreign Equity Securities [Member] Foreign equity securities Domestic Corporate Debt Securities [Member] Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries Collateralized Loan Obligations [Member] Collateralized loan obligation Represents high yield debt securities that are bought and held principally for the purpose of selling in the near term (thus held for only a short period of time). High Yield Trading Debt Securities [Member] High yield securities Represents the money market funds held in trading accounts that are bought and held principally for the purpose of selling in the near term (thus held for only a short period of time). Money Market Funds Held In Trading Accounts [Member] Money market funds held in trading accounts Represents information pertaining to other trading investments. Other Trading Investments [Member] Other trading securities Range [Axis] Range [Member] Range [Domain] Maximum [Member] Maximum Investment [Line Items] Investments Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Equity Securities, FV-NI Fair Value Equity Trading Securities Fair Value Trading securities Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). Debt Securities, Trading, Unrealized Gain (Loss) Change in unrealized gains (losses) on trading securities No definition available. Lower of Lifo Cost or Market [Abstract] At lower of LIFO cost or market: Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date, of live hogs and materials, before LIFO adjustment. Inventory Live Hogs and Materials before Lifo Adjustment, Net of Reserve Live hogs and materials Carrying amount of fresh pork and materials, net of valuation reserve and adjustment and before LIFO adjustment, as of the balance sheet date. Inventory Fresh Pork and Materials before Lifo Adjustment, Net of Reserve Fresh pork and materials The amount of LIFO (last in first out) inventory, net of valuation reserve and adjustment, before LIFO adjustment. Lifo Inventory before Lifo Adjustment, Net of Reserve Inventories at lower of LIFO cost or market, Gross Inventory, LIFO Reserve LIFO adjustment LIFO Inventory Amount Total inventories at lower of LIFO cost or market No definition available. Lower of Fifo Cost or Market [Abstract] At lower of FIFO cost and net realizable value: Carrying amount, net of valuation reserve and adjustment, as of the balance sheet date of grains and oilseeds. Inventory, Grains and Oilseeds, Net of Reserves Grains, oilseeds and other commodities Carrying amount, net of valuation reserve and adjustment, as of the balance sheet date of sugar produced and in process. Inventory, Sugar Produced and in Process, Net of Reserves Sugar produced and in process Other Inventory, Net of Reserves Other FIFO Inventory Amount Total inventories at lower of FIFO cost and net realizable value Weighted Average Cost Inventory Amount Grain, flour and feed at lower of weighted average cost and net realizable value Schedule reflecting pertinent information, such as tax authority, amounts, and expiration dates, of net operating loss carryforwards and tax credit carryforwards. Operating Loss and Tax Credit Carryforwards [Table] Operating Loss and Tax Credit Carryforwards [Line Items] Net operating loss carry-forwards and tax credit carry-forwards Amount of anticipated tax expense associated with the global intangible low-taxed income (“GILTI”) provision of the 2017 Tax Act. Anticipated Tax Expense Associated With Global Intangible Low Taxed Income Provision Anticipated tax expense associated with the global intangible low-taxed income (“GILTI”) provision of the 2017 Tax Act Amount of anticipated tax expense associated with the base-erosion and anti-abuse tax (“BEAT”) provision of the 2017 Tax Act. Anticipated Tax Expense Associated With Base Erosion And Anti Abuse Tax Provision anticipated tax expense associated with the base-erosion and anti-abuse tax (“BEAT”) provision of the 2017 Tax Act Amount of additional tax expense due to a change in tax status. Additional Tax Expense Due To Change In Tax Status Additional tax expense due to change in tax status Amount of additional deferred tax liabilities due to a change in tax status. Additional Deferred Tax Liabilities Due To Change In Tax Status Additional deferred tax liabilities due to change in tax status Amount of tax expense (benefit) on Federal blender’s credits recognized as revenue. Tax Expense Benefit On Federal Blenders Tax Credit Tax expense on Federal blender’s credits recognized as revenue Represents the one-time Federal blender's credits recognized as revenue. Income Taxes Federal Blenders One Time Tax Credit Recognized as Revenue One-time Federal blender's credits recognized as revenue Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Fair Value Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Measurements Recurring [Member] Recurring basis Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Inputs Level1 [Member] Level 1 Fair Value Inputs Level2 [Member] Level 2 Measurement Basis [Axis] Portion At Fair Value Fair Value Disclosure [Member] Portion at Fair Value Measurement [Member] Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value Fixed Income Funds [Member] Fixed income mutual funds Investment Type [Axis] Investment Type Categorization [Member] Investments [Domain] Short Term Investments [Member] Short term investments Other Current Assets [Member] Other current assets Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Commodity Contract [Member] Commodities Foreign Exchange Contract [Member] Foreign currencies Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets and liabilities measured at fair value on a recurring basis and also its level within the fair value hierarchy Represents the transfers into or out of level 1 fair value hierarchy that have taken place during the period. Fair Value Measurement Transfers into or out of Level 1 Transfers that occurred into or out of level 1 Represents the transfers into or out of level 2 fair value hierarchy that have taken place during the period. Fair Value Measurement Transfers into or out of Level 2 Transfers that occurred into or out of level 2 Represents the transfers into or out of level 3 fair value hierarchy that have taken place during the period. Fair Value Measurement Transfers into or out of Level 3 Transfers that occurred into or out of level 3 Assets, Fair Value Disclosure [Abstract] Assets: Derivative Asset Derivatives Asset Derivatives Assets, Fair Value Disclosure Total Assets Margin Deposit Assets Margin account Net Fair Value of Derivative Assets Net of Derivative Liabilities and Net of Margin Deposit Derivative assets and liabilities, net basis Liabilities, Fair Value Disclosure [Abstract] Liabilities: Derivative Liability Derivatives Liability Derivatives Financial and Nonfinancial Liabilities, Fair Value Disclosure Liabilities Derivative [Table] Derivative instrument whose primary underlying risk is tied to the purchase of commodities. Commodity Purchase Contract [Member] Net commodity purchase contracts Derivative instrument whose primary underlying risk is tied to the sale of commodities. Commodity Sale Contract [Member] Net commodity sale contracts Trading Activity [Axis] Trading Activity By Type [Domain] Derivative, Name [Domain] Represents the derivative instrument whose primary underlying risk is tied to grain. Grain [Member] Grain Represents the derivative instrument whose primary underlying risk is tied to hogs. Hogs [Member] Hogs Represents the derivative instrument whose primary underlying risk is tied to soybean oil. Soybean Oil [Member] Soybean oil Heating Oil [Member] Heating oil Derivative [Line Items] Derivative commodity instruments Derivative, Nonmonetary Notional Amount, Mass Nonmonetary notional amount Derivative, Nonmonetary Notional Amount, Volume Nonmonetary notional amount Derivative, Notional Amount Notional amounts Derivative Instruments, Gain (Loss) [Table] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost Of Sales [Member] Cost of sales Derivative Instruments, Gain (Loss) [Line Items] Amount of gain or (loss) recognized for each type of derivative and its location in the Consolidated Statements of Comprehensive Income Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Credit risk associated with derivative contracts Represents the number of counterparties with respect to whom the entity has counterparty credit risk related to derivative contracts. Derivative Credit Risk Number of Counterparties Number of counterparties Derivative, Gain (Loss) on Derivative, Net Amount of Gain or (Loss) Recognized in Income on Derivatives Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Current Liabilities [Member] Other current liabilities Derivatives, Fair Value [Line Items] Fair value of each type of derivative and its location in the Consolidated Balance Sheets Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plans Defined Benefit [Member] Defined benefit pension plan Defined Benefit Plan Disclosure [Line Items] Target allocation and pension plan asset allocation Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year Contributions expected to be made to defined benefit pension plans Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Components of net periodic benefit cost: Defined Benefit Plan, Service Cost Service cost Defined Benefit Plan, Interest Cost Interest cost Defined Benefit Plan, Expected Return on Plan Assets Expected return on plan assets The amount of gains or losses and any other periodic costs associated with defined benefit plans that are not separately disclosed, recognized in net periodic benefit cost. Defined Benefit Plan, Amortization and Other Costs Amortization and other Defined Benefit Plan, Net Periodic Benefit Cost Net periodic benefit cost A table or schedule providing information pertaining to short-term and long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. Schedule of Debt Instruments [Table] Related Party [Axis] Related Party [Domain] Related Party [Domain] Represents details pertaining to the foreign subsidiaries of the entity. Foreign Subsidiaries [Member] Foreign subsidiaries Z A [R] South African Rand A R [S] Argentine pesos Z M [W] Zambian kwacha Lender Name [Axis] Line Of Credit Facility Lender [Domain] Line of Credit Facility, Lender [Domain] Represents information related to Wells Fargo Bank, National Association. Wells Fargo Bank [Member] Wells Fargo Debt Instrument [Axis] Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Notes Payable To Banks [Member] Notes payable to bank A credit facility with no restrictions placed upon the lending institution regarding the amount of funds to be lent. Uncommitted Line Of Credit [Member] Uncommitted bank lines A credit facility whereby terms and conditions are clearly defined by the lending institution and imposed upon the borrowing entity. Committed Line Of Credit [Member] Committed bank line Unsecured Debt [Member] Term loan due 2022 Represents information related to foreign subsidiary obligations. Foreign Subsidiary Obligations [Member] Foreign subsidiary obligations due 2018 through 2023 Debt Instrument [Line Items] Debt Instrument Line of Credit Facility, Amount Outstanding Notes payable outstanding Debt Instrument, Interest Rate, Stated Percentage Interest rate (as a percent) Short-term Debt, Weighted Average Interest Rate Weighted average interest rate (as a percent) Line of Credit Facility, Maximum Borrowing Capacity Maximum capacity Short-term Debt Outstanding balance Letters of Credit Outstanding, Amount Letters of credit outstanding Long-term Debt Total long-term debt at face value Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Also includes the amount of debt discount that has yet to be amortized. Long Term Debt Current And Debt Instrument Unamortized Discount Current maturities of long-term debt and unamortized discount Long-term Debt, Excluding Current Maturities Long-term debt, less current maturities and unamortized discount Debt Instrument, Interest Rate, Effective Percentage Effective interest rate (as a percent) Loss Contingency [Abstract] Contingencies Represents the number of search warrants executed authorizing the seizure of certain records. Number of Search Warrants Executed Authorizing Seizure of Certain Records Number of search warrants executed authorizing the seizure of certain records from Seaboard's offices in Merriam, Kansas and at the Seaboard Foods employment office and the human resources department in Guymon, Oklahoma. Loss Contingency, New Claims Filed, Number Number of civil or criminal proceedings or charges filed Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Foreign Currency Adjustment Including Portion Attributable To Noncontrolling Interest [Member] Foreign currency translation adjustment Accumulated Net Investment Gain Loss Including Portion Attributable To Noncontrolling Interest [Member] Unrealized gain on investments Accumulated Defined Benefit Plans Adjustment Including Portion Attributable To Noncontrolling Interest [Member] Unrecognized pension cost Accumulated Translation Adjustment [Member] Cumulative foreign currency translation adjustment Legal Entity [Axis] Entity [Domain] Entity [Domain] Represents information related to certain subsidiaries of the entity. Certain Subsidiaries [Member] Certain subsidiaries U S [D] U.S. dollars Accumulated Other Comprehensive Income (Loss) [Line Items] Stockholders' Equity and Accumulated Other Comprehensive Loss Stock Repurchase Program, Authorized Amount Stock repurchase programs, authorized amount Stock Repurchased and Retired During Period, Shares Common shares repurchased Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Changes in the components of other comprehensive loss (OCL), net of related taxes Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Components of accumulated other comprehensive loss, net of related taxes Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease) Other comprehensive loss recognized related to devaluation of foreign currency Assets, Net Net assets (liabilities) Effective Income Tax Rate Reconciliation, Percent Effective income tax rate (as a percent) Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Cumulative foreign currency translation adjustment, net of related taxes Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent Tax expense (benefit) recorded on foreign currency translation adjustments Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax Unrecognized pension cost related to employees at certain subsidiaries Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Tax benefit recorded on unrecognized pension cost Schedule of Segment Reporting Information, by Segment [Table] Represents information related to the grain trading and flour milling business. Grain Trading And Flour Milling [Member] Grain trading and flour milling business Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships [Member] Customer relationships Segment Reporting Information [Line Items] Segment Information Number of Reportable Segments Number of reportable segments Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Earn-out, low end of range For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the low end of the potential time period of the consideration which may be paid. Business Combination Contingent Consideration Arrangements Range Of Outcomes Time Period Low Earn-out time period following closing, low end of range For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high end of the potential time period of the consideration which may be paid. Business Combination Contingent Consideration Arrangements Range Of Outcomes Time Period High Earn-out time period following closing, high end of range Represents the number of flour mills operated. Number Of Flour Mills Operated Number of flour mills operated Investments in and Advances to Affiliates, at Fair Value, Gross Additions Total consideration invested Equity Method Investment, Ownership Percentage Percentage of ownership Percentage of ownership interest accounted for as equity method investment Acquisition Payments to Acquire Businesses, Net of Cash Acquired Cash payment, net of $64 million of cash acquired Business Combination, Consideration Transferred, Liabilities Incurred Euro denominated note payable due 2021, 3.25% interest Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset Contingent consideration Business Combination, Consideration Transferred Total fair value of consideration at acquisition date Cash Acquired from Acquisition Cash acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] Purchase price allocation Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total liabilities assumed Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Less: Noncontrolling interest Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Net fair value of assets acquired Finite-Lived Intangible Assets, Net Intangible Assets Finite-Lived Intangible Asset, Useful Life Estimated useful life Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Net sales from the date of acquisition Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Net income from the date of acquisition Business Acquisition, Pro Forma Information [Abstract] Unaudited pro forma information: Business Acquisition, Pro Forma Revenue Net sales Business Acquisition, Pro Forma Net Income (Loss) Net income Acquisition Costs, Period Cost Acquisition costs Business Acquisition, Pro Forma Earnings Per Share, Basic Earnings per common share Represents the information pertaining to bakery business. Bakery Business [Member] Bakery business Investment Geographic Region [Axis] Investment Geographic Region [Domain] Investment Geographic Region [Domain] C [D] Democratic Republic of Congo Represents the percentage of notes receivable guaranteed by the other shareholder in the entity. Percentage Of Notes Receivable Guaranteed By Other Shareholder Percentage of note receivable guaranteed by the other shareholder Represents investment in holding company that owns a controlling interest in a Haitian port project. Haitian Port Project [Member] Holding company owning interest in Caribbean terminal operation Equity Method Investment, Other than Temporary Impairment Write-down on investment Allowance for Notes, Loans and Financing Receivable, Current Write down on notes receivable from affiliate Allowance for Doubtful Accounts Receivable, Current Write down on receivable from affiliate Represents the Turkey segment of the entity. Turkey [Member] Turkey Equity Method Investment, Summarized Financial Information, Assets Total assets Equity Method Investment, Summarized Financial Information, Revenue Net sales Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations before Extraordinary Items Operating income Equity Method Investment, Summarized Financial Information, Net Income (Loss) Net income Corporate Non Segment [Member] Corporate Items Revenues Sales to External Customers: Product [Member] Products Assistance, including, but not limited to, technology, license and maintenance, license and service, maintenance, oil and gas, and financial service. Service [Member] Services Article or substance produced by nature, labor or machinery and act of providing assistance, classified as other. Product And Service Other [Member] Other Adjustments for New Accounting Pronouncements [Axis] Type Of Adoption [Member] Type of Adoption [Domain] Accounting Standards Update201409 [Member] ASU 2014-09 Business Acquisition [Axis] Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Represents information related to Groupe Mimran. Groupe Mimran [Member] Mimran Accounting Standards Update 2017-07 Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. Accounting Standards Update201707 [Member] ASU 2017-07 Accounting Standards Update201601 [Member] ASU 2016-01 Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Difference Between Revenue Guidance In Effect Before And After Topic606 [Member] Adjustments Represents services provided by the entity related to transportation. Transportation [Member] Transportation Energy provided from operation of on-site facility or cogeneration plant and by procurement service to energy purchaser. Energy Service [Member] Energy Timing of Transfer of Good or Service [Axis] Timing Of Transfer Of Good Or Service [Domain] Timing of Transfer of Good or Service [Domain] Transferred At Point In Time [Member] Transferred at point in time Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue From Contract With Customer [Member] Net sales Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Calculated Under Revenue Guidance In Effect Before Topic606 [Member] Balances without adoption of Topic 606 Represents information related to other currencies. Other Currency [Member] Denominated in other foreign currencies Financial Instrument [Axis] Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Financial Instruments [Domain] Future [Member] Equity future contracts Equity [Member] Equity Investment Income Expense [Member] Other investment income (loss), net Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Trade Names [Member] Trade Names Minimum [Member] Minimum